Expansion cutter-head.



R. J. TULLY.

EXPANSION CUTTER HEAD.

APPLIGATION mun MAY 14,19

Patented Jan. 10, 1911.

R. JFTULLY.

AT! ovneys Tid PA NT @FFTCE.

ROBERT J. TULLY, OF NEW CASTLE, PENNSYLVANIA.

EXPANSION CUTTER-HEAD.

To (ZZZ whom it may concern.

Be it known that I, ROBERT J. TULLY, a citizen of the United States ofAmerica, residing at New Castle, in the county of Law rence and State ofPennsylvania, have invented certain new and useful Improve ments inExpansion Cutter-Heads, of which the following is a specification,reference being had therein to the accompanying drawmg.

This invention relates to expansion cutter heads, such as used on boringbars and similar devices for performing boring operations and the objectthereof is to provide a cutter head of such class in a manner ashereinafter set forth embodying an adjusting screw and traveling wedge.

A further object of the invention is to provide an expansion cutter headwith a traveling wedge and means engaging with the wedge whereby duringthe movement of the wedge to and from the cutters it will be held inplace.

A further object of the invention is to provide an expansion cutter headwith adjustable means in a manner as hereinafter set forth whereby thecutters are maintained in position.

Further objects of the invention are to provide an expansion cutter headwhich is simple in its construction and arrangement, strong, durableefiicient in its use, conveniently adjusted, inexepensive tomanufacture, and quickly coupled with a boring tool.

With the foregoing and other objects in view, the invention consists ofthe novel construction, combination and arrangement of parts ashereinafter more specifically described and illustrated in theaccompanying drawings wherein is shown one form of the embodiment of theinvention but it is to be understood that changes, variations andmodifications can be resorted to which come within the scope of theclaims hereunto appended.

In the drawings wherein like reference characters denote correspondingparts throughout the several views: Figure 1 is a longitudinal sectionalview of an expansion cutter head in accordance with this in vent-ion.Fig. 2 is an end view thereof. Fig. 3 is a section on line XX looking inthe direction of the arrow A, and, Fig. 4 is a section on line XXlooking in the direc tion of the arrow B.

Specification of Letters Patent.

Application filed May 14, 1910.

Fatented Jan. 1911.

Serial No. 561,307.

Referring to the drawings in detail, the cutter head consists of ahollow cylindrical body-portion 5 having oppositely-disposed andlongitudinally-extending slots, 6, 7. The inner face of the body-portion5 for a portion of its length is provided with threads 8 whereby saidbody-portion can be coupled with a boring rod. The inner face of thebody-portion 5 for a portion of its length is smooth at 9 and of lessdiameter than the portion 8. The inner face of the body-portion 5 for aportion of its length is provided with threads 18,'and the said portionis of greater diameter than the portions 8 or 9.

Mounted in the slots 6, 7, and of a length less than the length ofeither the slots (3, 7,

are the cutters 10, each having a portion of its inner face beveled asat 11. The beveled portion 11 of one cutter opposes the beveled portion11 of the other cutter. Arranged within the slots 6, 7, and interposedbetween one end wall thereof and the cutters is a keeper 12 formed witha centrally-disposed apertured circular portion 13. The keeper 12 isremovable. The keeper 12 is adapted to maintain the cutters 10 withinthe bodyportion 5 and is adjustable through the medium of a nut 14:engaging with the threads 10 and abutting against the keeper 12. Byscrewing in the nut 1 1 any looseness of the cutters which is desired tobe removed can be overcome. The shifting of the nut 14 inwardly forcesthe cutters 10 against the end walls 15 of the slots 6, 7, but theengagement of the cutters 10 with the end walls 15 is such as not topermit the adjusting of the cutters by being shifted outwardly in amanner as hereinafter referred to.

The nut 14 is formed with a centrally-disposed openin 16 and aright-angular disposed opening 17 which communicates at one end with theopening 16 and at its other end in a recess 18. Extending through thenut 1 1 is an adjusting screw comprising a shank 19 having a portion ofits length threaded as at 20 and the smooth portion formed with aperipheral groove 21 and terminating in a head 22 having projectingtherefrom a squared extension 23. The head 22 abuts against the outerend of the nut 14 when the adjusting screw is mounted in position. Theadjusting screw when mounted in position extends through the circularpor tion 13 of the keeper l2 and between the cutters 10. For couplingthe adjusting screw with the nut 14 but at the same time l from thecutters whereby the cutters can be to allow of the rotative movement ofsaid adjusting screw when occasion so requires, a headed screw 24:extends through the opening 17 and has its inner end engaging in thegroove 21-. The head of the screw 24 is seated in the recess 18.

Arranged within the body-portion 5 is a traveling wedge consisting of abody-pen tion 25 having oppositely-disposed beveled sides 26 andoppositely-disposed curved sides 27. The curved sides 27 engage theportion 9 of the inner face of the body 5. The traveling wedge 25 isformed with a screw-threaded opening 28 in which engages thescrew-threaded portion 20 of the shank 19 and the wedge when travelingin one direction is adapted to have its beveled sides engage the beveledportions 11 of the cutters for simultaneously shifting the cuttersoutward to expand the cutter head. One of the curved sides of thetraveling wedge is formed with a longitudinally-extending groove 29 inwhich extends the inner end of a guide screw 30 which is seated in thebody-portion 5 and. through the medium of the inner end of the screw 30the traveling wedge is maintained in position when shifted in eitherdirection.

WVhen the parts are in the position as shown in Fig. 1, and theadjusting screw revolved in one direction, the traveling wedge will bedrawn between the cutters l0 shifting these latter outwardly to expandthe cutter head whereby the cutters will be adjusted to the properpoint. If the adjusting screw is revolved in the opposite direction, thetraveling wedge will be shifted moved inwardly.

What I claim is:

An expansion cutter head comprising a hollow body portion provided withlongitudinally-extending slots, laterally shiftable cutters mounted inthe slots and having beveled inner ends, a transversely-extending keeperprojecting in said slots and abutting against the cutters for maintaingthem in proximity to the upper wall of said slots, said keeper having anenlarged centrally disposed apertured portion arranged medially of thebody portion, an adjusting screw extending through said circular portionand between the inner ends of the cutters, a traveling wedge engagingthe beveled ends of the cutters and shifted by said screw whereby thecutters are adjusted laterally when the wedge is shifted in onedirection, said screw provided with a peripheral groove, an adjustingnut surrounding the screw and abutting against the keeper for shiftingthe latter toward the upperends of the slots whereby the cutters aremaintained in position, said nut provided with a rightangularly disposedopening, and a hold-fast device extending through the right-angularlydisposed opening in the nut and engaging in the groove of the screw forcoupling the latter to the nut.

In testimony whereof I aflix my signature in the presence of twowitnesses.

ROBERT J. TULLY.

IVitnesses ROBERT J. LOWREY, GEORGE E. B. Hoosrox.

